Optimize performance and improve query handling in PostgreSQL integration - WIP#5196

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rahim-kanji wants to merge 7 commits intov3.0from

v3.0_optimizations_and_stability

Commits on Oct 29, 2025

Backport PQsendPipelineSync from PostgreSQL 17 and update code to use it
rahim-kanji
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Buffer response until Extended Query frame completes; send early only if resultset threshold is reached.
rahim-kanji
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Introduce inline functions for efficient ASCII whitespace detection and uint32-to-string conversion
rahim-kanji
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Commits on Nov 6, 2025

Optimize hot path: replace std::string with char[] to avoid heap
rahim-kanji
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Commits on Nov 10, 2025